Fuel nozzle and single-head combustion chamber test apparatus comprising same

Abstract

The application discloses a fuel nozzle and a single-head combustion chamber test device comprising the same, which is fixed on a casing assembly and extends into a combustion chamber of a flame tube assembly, and comprises a pre-combustion stage oil path and a main combustion stage oil path, which respectively have a pre-combustion stage nozzle and a main combustion stage nozzle; the fuel nozzle further comprises a mounting seat cover plate which is fixed on the casing assembly, and the pre-combustion stage nozzle and the main combustion stage nozzle are detachably fixed on the mounting seat cover plate; the main combustion stage nozzle is in a circular ring shape, has a through hole in the center, and the pre-combustion stage nozzle penetrates through the through hole and is sleeved in the main combustion stage nozzle. Through the fuel nozzle and the single-head combustion chamber test device comprising the same, the pre-combustion stage nozzle and the main combustion stage nozzle are designed as two independent assemblies, cross test of different schemes of the pre-combustion stage nozzle and different schemes of the main combustion stage nozzle can be freely combined, and multi-scheme fuel nozzles can be rapidly assembled, so that the test efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engines, and in particular to a fuel nozzle and a single-head combustion chamber test apparatus including the same. Background Technology

[0002] Currently, single-head testing is commonly used in the development of aero-engine combustor components to verify and optimize component designs. This requires a single-head combustor test device capable of simulating key characteristics of the component design, testing different combustor head designs for ignition / quenching, combustion efficiency, and emissions, obtaining performance data on emissions, combustion efficiency, and ignition / quenching, and selecting one or more head designs that meet emission standards, have high combustion efficiency, and excellent ignition / quenching performance as the basis for component design optimization, providing data support for sector-shaped and full-ring test specimens. Since dozens of head designs are often developed during the aero-engine combustor design verification phase, the manufacturing cost and cycle time for each fuel nozzle in the head design are extremely high if the currently common 3D printing technology is used, which restricts the testing efficiency and development progress of aero-engines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of combustion nozzles with different head designs in the prior art, and to provide a fuel nozzle and a single-head combustion chamber test device including the same.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A fuel nozzle, fixed to a casing assembly and extending into the combustion chamber of a flame tube assembly, includes a pre-combustion stage fuel passage and a main combustion stage fuel passage, each having a pre-combustion stage nozzle and a main combustion stage nozzle. The fuel nozzle further includes a mounting cover plate fixed to the casing assembly. The pre-combustion stage nozzle and the main combustion stage nozzle are detachably fixed to the mounting cover plate. The main combustion stage nozzle is annular, with a through hole at its center. The pre-combustion stage nozzle passes through the through hole and fits inside the main combustion stage nozzle.

[0006] In this scheme, the pre-combustion stage nozzle and the main combustion stage nozzle are designed as two independent components. Compared with the traditional engine products that design the pre-combustion stage nozzle and the main combustion stage nozzle as a whole, different schemes of pre-combustion stage nozzles and different schemes of main combustion stage nozzles can be freely combined through cross-testing, and multiple schemes of fuel nozzles can be quickly assembled. This allows for rapid verification of the impact of different structural parameters on the overall performance of the entire fuel nozzle assembly, effectively improving test efficiency.

[0007] Preferably, the diameter of the fuel available for flow in the pre-combustion stage fuel circuit gradually decreases from the inlet to the pre-combustion stage nozzle; and / or

[0008] The diameter of the fuel available for flow in the main combustion stage fuel circuit gradually decreases from the fuel inlet to the main combustion stage nozzle.

[0009] In this design, the aforementioned structure is used, with the oil passage diameter decreasing from coarse to fine between the fuel supply pipe and the nozzle connection. On one hand, the coarse diameter design at the top increases the rigidity of the entire fuel nozzle, making the positioning between the nozzle and the casing more reliable and secure. On the other hand, the fine diameter design at the bottom increases the fuel flow velocity near the fuel inlet, improving high-efficiency injection and reducing the risk of fuel coking.

[0010] Preferably, the pre-combustion stage oil circuit further includes a pre-combustion stage oil supply pipe connected to the pre-combustion stage nozzle, and the main combustion stage oil circuit further includes a main combustion stage oil supply pipe connected to the main combustion stage nozzle. The mounting base cover plate is provided with a pre-combustion stage oil circuit positioning hole and a main combustion stage oil circuit positioning hole. The pre-combustion stage oil circuit supply pipe is fixed to the pre-combustion stage oil circuit positioning hole, and the main combustion stage oil circuit supply pipe is fixed to the main combustion stage oil circuit positioning hole.

[0011] In this solution, the aforementioned structure is used, with the fuel supply pipe and mounting cover plate employing a hole-shaft overlapping fit. When it is necessary to verify the effect of the distance D between the pre-combustion stage nozzle orifice and the main combustion stage nozzle splash deflector on fuel atomization, only the relative positions of the fuel line positioning holes on the mounting cover plate need to be changed to achieve the change of distance D. Compared with the traditional engine products that design the pre-combustion stage nozzle and the main combustion stage nozzle as a single unit, this solution reduces processing costs and cycle time, and improves testing efficiency by processing multiple sets of low-cost mounting cover plates instead of multiple high-cost, long-cycle fuel nozzle assemblies.

[0012] Preferably, the mounting cover plate further includes an oil pipe mounting seat, which is disposed at the pre-combustion stage oil circuit positioning hole position and the main combustion stage oil circuit positioning hole position, and the oil pipe mounting seat includes an external thread portion;

[0013] The main combustion stage fuel supply pipe and the pre-combustion stage fuel supply pipe are provided with fastening nuts. The fastening nuts have internal threaded holes. The main combustion stage fuel supply pipe and the pre-combustion stage fuel supply pipe pass through the external threaded portion and are respectively fixed to the pre-combustion stage fuel supply positioning hole and the main combustion stage fuel supply positioning hole. The fastening nuts are fixed to the external threaded portion by threaded connection.

[0014] In this solution, the above structure is adopted, and by setting fastening nuts on the oil pipe mounting base and the oil supply pipe, the connection and sealing between the mounting base cover plate and the pre-combustion stage oil supply pipe and the main combustion stage oil supply pipe are effectively realized.

[0015] Preferably, the fastening nut is provided with a ball head seal, and the inner side of the external thread portion of the oil pipe mounting seat is provided with a conical surface. When the fastening nut is fixed to the oil pipe mounting seat, the ball head seal abuts against the conical surface.

[0016] In this solution, the above-mentioned structure is adopted, and a fastening nut is used to compress the easily deformable copper ball head seal, so that the ball head seal deforms and clamps the fuel line to realize the installation and positioning of the nozzle. The assembly is simple and convenient. At the same time, the spherical surface of the ball head seal and the conical surface of the fuel line mounting seat can be used to achieve a line seal fit to prevent the leakage of high temperature and high pressure gas inside the casing.

[0017] Preferably, the pre-combustion stage oil supply pipe is provided with a pre-combustion stage oil pipe connector at the top, and the inner side of the pre-combustion stage oil pipe connector is provided with a conical surface. The pre-combustion stage oil circuit also includes a spherical oil inlet connector, which has a spherical connecting portion. When the spherical oil inlet connector is connected to the pre-combustion stage oil pipe connector, the spherical connecting portion abuts against the conical surface; and / or

[0018] The main combustion stage fuel supply pipe is provided with a main combustion stage fuel pipe connector at the top. The main combustion stage fuel pipe connector has a conical surface on its inner side. The main combustion stage fuel circuit also includes a spherical fuel inlet connector. The spherical fuel inlet connector has a spherical connecting part. When the spherical fuel inlet connector is connected to the main combustion stage fuel pipe connector, the spherical connecting part abuts against the conical surface.

[0019] In this solution, the above structure is adopted, and an oil pipe joint with external threads is welded to the top of the fuel line. Its conical surface and the ball head surface of the spherical oil inlet joint are fitted with a line seal. When the pressure cap and the oil pipe joint are tightened by the thread, the fuel seal can be achieved here to prevent fuel leakage under high oil pressure.

[0020] Preferably, the pre-combustion stage nozzle includes a pre-combustion stage main nozzle and a pre-combustion stage auxiliary nozzle. The pre-combustion stage main nozzle includes a pre-combustion stage main oil supply pipe and a main nozzle sleeve connected to the pre-combustion stage main oil supply pipe. The pre-combustion stage auxiliary nozzle includes a pre-combustion stage auxiliary oil supply pipe and an auxiliary nozzle sleeve connected to the pre-combustion stage auxiliary oil supply pipe. The main nozzle sleeve and the auxiliary nozzle sleeve are interconnected and lead to the combustion chamber of the flame tube assembly. The pre-combustion stage auxiliary oil supply pipe and the pre-combustion stage main oil supply pipe are mutually closed.

[0021] In this design, the pre-combustion stage nozzle consists of two parallel nozzles (main and auxiliary) and a separate oil supply pipe. This allows for easier design of different pre-combustion stage nozzle schemes. Furthermore, by independently setting the nozzle orifices and oil supply pipes of the main and auxiliary pre-combustion stage nozzles, different schemes can be tested without altering the structure of other components when changing key design parameters on the nozzle sleeve (such as the nozzle orifice diameter, the number of swirling channels, the channel width, and the channel depth). This approach is more economical and efficient.

[0022] Preferably, the pre-combustion stage nozzle further includes an adapter, the pre-combustion stage main oil supply pipe and the pre-combustion stage auxiliary oil supply pipe are welded to the adapter, the main nozzle sleeve is threaded to the adapter, the auxiliary nozzle sleeve is disposed inside the main nozzle sleeve, and the main nozzle sleeve is threaded to press the auxiliary nozzle sleeve to the adapter.

[0023] In this solution, by setting up an adapter that is welded to the main and auxiliary oil supply pipes, the main and auxiliary nozzle sleeves can be easily installed or removed by means of threaded connection, which makes it easier to test different schemes and is more economical and efficient.

[0024] Preferably, the pre-combustion stage nozzle further includes a swirling core disposed within the secondary nozzle sleeve. The swirling core connects the pre-combustion stage secondary oil passage of the adapter and the oil outlet of the secondary nozzle sleeve. The side of the swirling core facing the adapter has a spherical connecting end, and the side of the adapter's pre-combustion stage secondary oil passage connected to the swirling core has a conical connecting end. The secondary nozzle sleeve presses against the swirling core, and the spherical connecting end abuts against the conical connecting end.

[0025] In this scheme, the swirling core (25) can be pressed by pressing the auxiliary nozzle sleeve. Since the contact surface between the swirling core and the adapter is a line contact seal between the spherical surface and the conical surface, pressing the swirling core can ensure that the main and auxiliary oil circuits do not cross-flow.

[0026] A single-head combustion chamber test apparatus includes a casing assembly, a flame tube assembly, and a fuel nozzle as described above, the fuel nozzle being fixed to the casing assembly and extending into the flame tube assembly.

[0027] In this scheme, the single-head combustion chamber test device can test the main performance of different combustion chamber head schemes, such as ignition and flameout, combustion efficiency, and pollution emissions. At the same time, the processing and manufacturing cost is low and the cycle is short, thereby accelerating the test efficiency and development progress.

[0028] The positive and progressive effects of this invention are as follows: This invention discloses a fuel nozzle and a single-head combustion chamber test device. This fuel nozzle designs the pre-combustion stage nozzle and the main combustion stage nozzle as two independent components. Compared with the traditional engine products that design the pre-combustion stage nozzle and the main combustion stage nozzle as a whole, it can realize the free combination of different schemes of pre-combustion stage nozzles and different schemes of main combustion stage nozzles through cross-testing, and the rapid assembly of multiple schemes of fuel nozzles. This allows for the rapid verification of the impact of different structural parameters on the overall performance of the entire fuel nozzle assembly, effectively improving the test efficiency. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the structure of a single-head combustion chamber test device according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of the fuel nozzle according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of the mounting base cover plate according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the pre-combustion stage nozzle according to an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the main combustion stage nozzle according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] Casing assembly 1

[0036] Flame tube assembly 2

[0037] Fuel Injector 3

[0038] Mounting cover plate 7

[0039] Pre-combustion stage nozzle 8

[0040] Main combustion nozzle 9

[0041] Pre-combustion stage auxiliary oil circuit supply pipe 10

[0042] Pre-combustion stage main oil circuit supply pipe 11

[0043] Main combustion stage fuel supply line 12

[0044] Oil pipe mounting bracket 13

[0045] Ball head seal 14

[0046] Fastening nut 15

[0047] Oil pipe fitting 16

[0048] Cap 17

[0049] 18 Spherical oil inlet connector

[0050] Pre-combustion stage auxiliary oil circuit positioning hole 19

[0051] Pre-combustion stage main oil circuit positioning hole 20

[0052] Main combustion stage fuel line positioning hole 21

[0053] Adapter 22

[0054] Secondary nozzle sleeve 23

[0055] Main nozzle sleeve 24

[0056] Swirl Core 25

[0057] Flange face 26

[0058] Conical connecting end 27

[0059] Tightening point 28

[0060] Main combustion stage cyclone 29

[0061] Adapter 30

[0062] Pre-combustion nozzle lap joint 31

[0063] Adapter board 32

[0064] Direct nozzle 33

[0065] Transition adapter 34 Detailed Implementation

[0066] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0067] like Figure 1 As shown, the single-head combustion chamber test device in this embodiment consists of a casing assembly 1, a flame tube assembly 2, and a fuel nozzle 3. The nozzle outlet end of the fuel nozzle 3 faces the flame tube assembly 2, and the upper end of the fuel nozzle 3 is fixed to the casing assembly 1. During the operation of the single-head combustion chamber test device, gas enters the casing assembly 1 from the front end of the casing assembly 1. The gas flow passes through the pre-combustion stage swirler and the main combustion stage swirler 29 on the fuel nozzle 3 and enters the flame tube assembly 2. It mixes with the fuel sprayed from the fuel nozzle 3 assembly and is then ignited to carry out the combustion process. In the test, the main performance of different combustion chamber head schemes, such as ignition and flameout, combustion efficiency, and pollution emissions, are tested to obtain performance data such as emissions, combustion efficiency, and ignition and flameout. One or more head schemes that meet emission standards, have high combustion efficiency, and have excellent ignition and flameout performance are selected as the basis for component scheme optimization and provide data support for sector and full-ring test specimens.

[0068] This single-head combustion chamber test device can test the main performance of different combustion chamber head designs, such as ignition and flameout, combustion efficiency, and pollution emissions. At the same time, it has low processing and manufacturing costs and short cycle, thereby accelerating the testing efficiency and development progress.

[0069] like Figure 2 , 3As shown, in this embodiment, the fuel nozzle 3 is fixed on the casing assembly 1 and extends into the combustion chamber of the flame tube assembly 2. It includes a pre-combustion stage fuel passage and a main combustion stage fuel passage, and has a pre-combustion stage nozzle 8 and a main combustion stage nozzle 9 respectively. The fuel nozzle 3 also includes a mounting cover plate 7, which is fixed on the casing assembly 1. The pre-combustion stage nozzle 8 and the main combustion stage nozzle 9 are detachably fixed to the mounting cover plate 7. The main combustion stage nozzle 9 is annular and has a through hole in the center. The pre-combustion stage nozzle 8 passes through the through hole and is fitted inside the main combustion stage nozzle 9.

[0070] In this embodiment, the mounting base cover 7 is fixed to the casing assembly 1 by screws through the pre-combustion stage nozzle 8 and the main combustion stage nozzle 9. In this embodiment, the through hole is located in the middle of the pre-combustion stage nozzle lap joint 3131.

[0071] By designing the pre-combustion nozzle 8 and the main combustion nozzle 9 as two independent components, compared with the traditional engine products that design the pre-combustion nozzle 8 and the main combustion nozzle 9 as a whole, it is possible to freely combine different schemes of the pre-combustion nozzle 8 and the main combustion nozzle 9 through cross-testing, and to quickly assemble multiple schemes of fuel nozzle 3. This allows for rapid verification of the impact of different structural parameters on the overall performance of the entire fuel nozzle 3 assembly, effectively improving test efficiency.

[0072] like Figure 2 As shown, the pre-combustion stage oil circuit also includes a pre-combustion stage oil supply pipe connected to the pre-combustion stage nozzle 8, and the main combustion stage oil circuit also includes a main combustion stage oil supply pipe 12 connected to the main combustion stage nozzle 9. The mounting base cover plate 7 is provided with a pre-combustion stage oil circuit positioning hole and a main combustion stage oil circuit positioning hole 21. The pre-combustion stage oil circuit supply pipe is fixed to the pre-combustion stage oil circuit positioning hole, and the main combustion stage oil circuit supply pipe 12 is fixed to the main combustion stage oil circuit positioning hole 21.

[0073] In this embodiment, the pre-combustion stage oil circuit positioning holes include a pre-combustion stage main oil circuit positioning hole 20 and a pre-combustion stage auxiliary oil circuit positioning hole 19, which correspond to the pre-combustion stage main oil circuit supply pipe 11 and the pre-combustion stage auxiliary oil circuit supply pipe 10, respectively. The pre-combustion stage main oil circuit positioning hole 20, the pre-combustion stage auxiliary oil circuit positioning hole 19, and the main combustion stage oil circuit positioning hole 21 are sequentially opened on the mounting base cover plate 7.

[0074] The fuel supply pipe and the mounting cover plate 7 are connected by a hole-shaft overlap. When it is necessary to verify the effect of the distance D between the pre-combustion stage nozzle 8 and the splash plate of the main combustion stage nozzle 9 on fuel atomization, it is only necessary to change the relative positions of the pre-combustion stage main fuel circuit positioning hole 20, the pre-combustion stage auxiliary fuel circuit positioning hole 19, and the main combustion stage fuel circuit positioning hole 21 on the nozzle mounting cover plate 7 to change the distance D. Compared with the traditional engine products that design the pre-combustion stage nozzle 8 and the main combustion stage nozzle 9 as a whole, processing multiple sets of low-cost nozzle mounting cover plates 7 instead of processing multiple high-cost and long-cycle fuel nozzle 3 assemblies reduces processing costs and processing cycle, and improves test efficiency.

[0075] like Figure 2 As shown, the diameter of the fuel available for flow in the pre-combustion stage fuel circuit and the main combustion stage fuel circuit gradually decreases from the fuel inlet to the pre-combustion stage nozzle 8.

[0076] In this embodiment, the pipe diameters of the pre-combustion stage auxiliary oil supply pipe 10, the pre-combustion stage main oil supply pipe 11, and the main combustion stage oil supply pipe 12, which connect to the nozzles, are all designed to decrease in diameter from thick to thin. The upstream pre-combustion stage auxiliary oil supply pipe, the upstream pre-combustion stage main oil supply pipe 11, and the downstream main combustion stage nozzle 9 and the downstream pre-combustion stage nozzle 8 have the thinnest oil supply pipe diameters. The oil supply pipes and nozzles are welded together via transition adapters 34.

[0077] Between the fuel supply pipe and the nozzle connection, the fuel passage diameter adopts a structure design that gradually decreases from coarse to fine. On the one hand, the coarse diameter design at the top increases the rigidity of the entire fuel nozzle 3, making the positioning between the nozzle and the casing assembly 1 more reliable and secure. On the other hand, the fine diameter design at the bottom increases the fuel flow rate near the fuel injection port, improves high injection efficiency, and also reduces the risk of fuel coking.

[0078] like Figure 3 As shown, the mounting cover 7 also includes an oil pipe mounting seat 13, which is located at the pre-combustion stage oil circuit positioning hole and the main combustion stage oil circuit positioning hole 21. The oil pipe mounting seat 13 includes an external thread. The main combustion stage oil circuit supply pipe 12 and the pre-combustion stage oil circuit supply pipe are provided with fastening nuts 15, which have internal thread holes. The main combustion stage oil circuit supply pipe 12 and the pre-combustion stage oil circuit supply pipe pass through the external thread and are respectively fixed to the pre-combustion stage oil circuit positioning hole and the main combustion stage oil circuit positioning hole 21. The fastening nuts 15 are fixed to the external thread by threaded connection.

[0079] In this embodiment, there are three oil pipe mounting seats 13, which are sequentially welded to the mounting seat cover plate 7 at positions corresponding to the positioning holes 20, 19, and 21 of the pre-combustion stage main oil circuit, and the main combustion stage oil circuit, respectively, and surround the three positioning holes. The three oil supply pipes are fixed in the three positioning holes through the oil pipe mounting seats 13. The fastening nuts 15 are connected to the outer walls of the main combustion stage oil circuit supply pipe 12, the pre-combustion stage main oil circuit supply pipe 11, and the pre-combustion stage auxiliary oil circuit supply pipe 10. An annular internal thread hole is formed between the edge of the fastening nut 15 and the outer wall. The external threaded part of the oil pipe mounting seat 13 extends into the internal thread hole and is connected by threads.

[0080] By setting the oil pipe mounting seat 13 and the fastening nut 15 on the oil supply pipe, the connection and sealing between the mounting seat cover plate 7 and the pre-combustion stage oil supply pipe and the main combustion stage oil supply pipe 12 can be effectively achieved.

[0081] like Figure 3 As shown, the fastening nut 15 is provided with a ball head seal 14, and the inner side of the external thread of the oil pipe mounting seat 13 is provided with a conical surface. When the fastening nut 15 is fixed to the oil pipe mounting seat 13, the ball head seal 14 abuts against the conical surface.

[0082] In this embodiment, the ball-head seal 14 is a hemispherical component with a through hole in the center. The ball-head seal 14 is fitted onto the oil supply pipe through this through hole, and a fastening nut is also fitted onto the oil supply pipe. One flat end of the ball-head seal 14 faces the fastening nut and is inserted into the internal threaded hole, while the spherical end faces the oil pipe mounting base 13. The external thread of the oil pipe mounting base 13 has a tapered opening communicating with the positioning hole, and the side of the tapered opening facing the ball-head seal 14 forms a tapered surface. During connection, the oil supply pipe is installed in the positioning hole, and the fastening nut 15 is connected to the oil pipe mounting base 13. The internal thread of the fastening nut 15 is threadedly connected to the external thread of the oil pipe mounting base 13, pressing the ball-head seal 14 inside the fastening nut 15 onto the tapered surface of the tapered opening of the oil pipe mounting base 13. The ball-head seal 14 can be tightened by tightening the fastening nut 15, causing it to deform and thus achieving clamping and positioning of the oil supply pipe. Meanwhile, the spherical surface of the ball head seal 14 and the conical surface achieve a line seal fit, which can prevent the leakage of high temperature and high pressure gas inside the casing assembly 1.

[0083] In this embodiment, the ball head seal 14 is made of copper, which has low hardness and is easy to deform, making it easier to achieve clamping positioning and line sealing effects.

[0084] The ball head seal 14, which is made of easily deformable copper material, is pressed by fastening nut 15. The ball head seal 14 is deformed and clamps the fuel line to realize the installation and positioning of the nozzle. The assembly is simple and convenient. At the same time, the spherical surface of the ball head seal 14 and the conical surface of the fuel line mounting seat 13 can be used to achieve a line seal fit to prevent the leakage of high temperature and high pressure gas inside the casing assembly 1.

[0085] like Figure 3 As shown, the pre-combustion stage fuel supply pipe is equipped with a pre-combustion stage fuel pipe connector 16 at its top. The pre-combustion stage fuel pipe connector 16 has a conical surface on its inner side. The pre-combustion stage fuel circuit also includes a spherical inlet connector 18, which is connected to the fuel inlet. The spherical inlet connector 18 has a spherical connecting part. When the spherical inlet connector 18 is connected to the pre-combustion stage fuel pipe connector 16, the spherical connecting part abuts against the conical surface. The main combustion stage fuel supply pipe 12 is equipped with a main combustion stage fuel pipe connector at its top. The main combustion stage fuel pipe connector has a conical surface on its inner side. The main combustion stage fuel circuit also includes a spherical inlet connector 18, which is connected to the fuel inlet. The spherical inlet connector 18 has a spherical connecting part. When the spherical inlet connector 18 is connected to the main combustion stage fuel pipe connector, the spherical connecting part abuts against the conical surface.

[0086] In this embodiment, the uppermost point of each oil passage is the oil inlet, from which fuel enters the oil passage. For example... Figure 3 As shown, the pre-combustion stage auxiliary fuel circuit includes a fuel pipe connector 16, which is located at the top of and connected to the fuel supply pipe 10 of the pre-combustion stage auxiliary fuel circuit. The pre-combustion stage auxiliary fuel circuit also includes a spherical fuel inlet connector 18, one end of which is connected to the fuel inlet and the other end to the fuel pipe connector 16. The fuel pipe connector 16 has external threads on the outside and a tapered hole on the inside. The spherical fuel inlet connector 18 has a spherical connecting part, which can abut against the tapered surface of the tapered hole of the fuel pipe connector 16 when connected. The spherical fuel inlet connector 18 and the fuel pipe connector 16 are connected by a pressure cap 17. The pressure cap 17 is fitted onto the spherical fuel inlet connector 18 and threadedly connected to the fuel pipe connector 16. When the pressure cap 17 and the fuel pipe connector 16 are tightened by threads, the spherical connecting part can be pressed to achieve a fuel seal at the fuel inlet connector.

[0087] The sealing structure here is largely the same as the sealing structure at oil pipe mounting seat 13, and the oil inlet at the top of the pre-combustion stage main oil circuit and the main combustion stage oil circuit is completely the same as the pre-combustion stage auxiliary oil circuit, so it will not be described in detail again.

[0088] A threaded fuel line connector 16 is welded to the top of the fuel line. Its conical surface is fitted with the ball head surface of the spherical fuel inlet connector 18 through a line seal. When the pressure cap 17 is tightened with the fuel line connector 16 through the thread, the fuel seal can be achieved here to prevent fuel leakage under high oil pressure.

[0089] like Figures 2 to 4As shown, the pre-combustion stage nozzle 8 in this embodiment includes two independent pre-combustion stage main nozzles and pre-combustion stage auxiliary nozzles. The pre-combustion stage main nozzle includes a pre-combustion stage main oil supply pipe 11 and a main nozzle sleeve 24 connected to the pre-combustion stage main oil supply pipe 11. The pre-combustion stage auxiliary nozzle includes a pre-combustion stage auxiliary oil supply pipe 10 and an auxiliary nozzle sleeve 23 connected to the pre-combustion stage auxiliary oil supply pipe 10. The main nozzle sleeve 24 and the auxiliary nozzle sleeve 23 are interconnected and lead to the combustion chamber of the flame tube assembly 2. The pre-combustion stage auxiliary oil supply pipe 10 and the pre-combustion stage main oil supply pipe are mutually closed.

[0090] In this embodiment, in the main fuel circuit of the pre-combustion stage, fuel enters from the fuel supply pipe 11 and flows out along the flow path P2. In the auxiliary fuel circuit of the pre-combustion stage, fuel enters from the fuel supply pipe 10 and flows out along the flow path P1, thus achieving the design requirement of a dual flow path for the pre-combustion stage fuel.

[0091] The pre-combustion stage nozzle 8 is set with two parallel nozzles, a main nozzle and a secondary nozzle, and a separate oil supply pipe. This makes it easier to design different pre-combustion stage nozzle 8 schemes. Furthermore, setting the nozzle orifices and oil supply pipes of the main pre-combustion stage nozzle and the secondary pre-combustion stage nozzle independently allows for the experimentation of different schemes without changing the structure of other parts when changing key design parameters on the nozzle sleeve (such as the orifice diameter, the number of swirling grooves, the groove width, the groove depth, etc.). This is more economical and efficient.

[0092] like Figure 4 As shown, the pre-combustion stage nozzle 8 also includes an adapter 22. The pre-combustion stage main oil supply pipe 11 and the pre-combustion stage auxiliary oil supply pipe 10 are welded to the adapter 22. The main nozzle sleeve 24 is connected to the adapter 22 by a thread. The auxiliary nozzle sleeve 23 is set inside the main nozzle sleeve 24. The main nozzle sleeve 24 presses the auxiliary nozzle sleeve 23 to the adapter 22 by a threaded connection.

[0093] In this embodiment, the main nozzle sleeve 24 and the adapter 22 are connected by threads and sealed by argon arc welding at the tightening point 28 to prevent fuel leakage under high oil pressure.

[0094] By setting up an adapter 22 that is welded to the main and auxiliary oil supply pipes, the auxiliary nozzle sleeve 23 can be easily installed or removed by means of a threaded connection, making it easier to experiment with different schemes and more economical and efficient.

[0095] like Figure 4 As shown, the pre-combustion stage nozzle 8 also includes a swirling core 25, which is disposed inside the auxiliary nozzle sleeve 23. The swirling core 25 connects the pre-combustion stage auxiliary oil passage of the adapter 22 and the oil outlet of the auxiliary nozzle sleeve 23. The side of the swirling core 25 facing the adapter 22 has a spherical connecting end, and the side of the adapter 22 that connects to the pre-combustion stage auxiliary oil passage of the swirling core 25 has a conical connecting end 27. The auxiliary nozzle sleeve 23 presses the swirling core 25, and the spherical connecting end abuts against the conical connecting end 27.

[0096] The swirling core 25 is pressed by pressing the flange face 26 on the auxiliary nozzle sleeve 23. Since the spherical connection end of the swirling core 25 and the conical connection end 27 of the adapter 22 are sealed by the line contact between the spherical and conical surfaces, pressing the swirling core 25 can ensure that the oil circuits P1 and P2 do not cross-contaminate.

[0097] like Figure 5 As shown, the main combustion stage nozzle 9 consists of a main combustion stage fuel supply pipe 12, a connector 30, a connector plate 32, a direct injection nozzle 33, a main combustion stage swirler 29, and a pre-combustion stage nozzle lap joint 31. All components are welded together to ensure no fuel leakage. The independent design of the direct injection nozzle 33 and the swirler allows for changes to key design parameters (such as the number of nozzles, nozzle diameter, and nozzle angle in the direct injection nozzle 33, and the number, width, and height of channels in the swirler) by simply adding direct injection nozzles 33 and swirlers of different configurations while keeping the structure of the remaining parts of the main combustion stage nozzle 9 unchanged. This reduces the number of components from design to manufacturing, effectively lowering processing costs and shortening the processing cycle.

[0098] In this embodiment, the main combustion stage cyclone separator 29 is annular, and the central part is the pre-combustion stage nozzle joint 31, with the through hole opened on the pre-combustion stage nozzle joint 31.

[0099] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A fuel nozzle, fixed to a casing assembly and extending into the combustion chamber of a flame tube assembly, comprising a pre-combustion stage fuel passage and a main combustion stage fuel passage, each having a pre-combustion stage nozzle and a main combustion stage nozzle, characterized in that, The fuel nozzle also includes a mounting cover plate, which is fixed to the casing assembly. The pre-combustion stage nozzle and the main combustion stage nozzle are detachably fixed to the mounting cover plate. The main combustion stage nozzle is annular and has a through hole in the center. The pre-combustion stage nozzle passes through the through hole and is fitted inside the main combustion stage nozzle. The pre-combustion stage nozzle includes a pre-combustion stage main nozzle and a pre-combustion stage auxiliary nozzle. The pre-combustion stage main nozzle includes a pre-combustion stage main oil supply pipe and a main nozzle sleeve connected to the pre-combustion stage main oil supply pipe. The pre-combustion stage auxiliary nozzle includes a pre-combustion stage auxiliary oil supply pipe and an auxiliary nozzle sleeve connected to the pre-combustion stage auxiliary oil supply pipe. The main nozzle sleeve and the auxiliary nozzle sleeve are interconnected and lead to the combustion chamber of the flame tube assembly. The pre-combustion stage auxiliary oil supply pipe and the pre-combustion stage main oil supply pipe are mutually closed.

2. The fuel nozzle as described in claim 1, characterized in that, The diameter of the fuel available for flow in the pre-combustion stage fuel circuit gradually decreases from the inlet to the pre-combustion stage nozzle; and / or The diameter of the fuel available for flow in the main combustion stage fuel circuit gradually decreases from the fuel inlet to the main combustion stage nozzle.

3. The fuel nozzle as described in claim 1, characterized in that, The pre-combustion stage oil circuit also includes a pre-combustion stage oil supply pipe connected to the pre-combustion stage nozzle, and the main combustion stage oil circuit also includes a main combustion stage oil supply pipe connected to the main combustion stage nozzle. The mounting base cover plate is provided with a pre-combustion stage oil circuit positioning hole and a main combustion stage oil circuit positioning hole. The pre-combustion stage oil circuit supply pipe is fixed to the pre-combustion stage oil circuit positioning hole, and the main combustion stage oil circuit supply pipe is fixed to the main combustion stage oil circuit positioning hole.

4. The fuel nozzle as described in claim 3, characterized in that, The mounting cover plate also includes an oil pipe mounting seat, which is located at the pre-combustion stage oil circuit positioning hole and the main combustion stage oil circuit positioning hole, and the oil pipe mounting seat includes an external thread portion; The main combustion stage fuel supply pipe and the pre-combustion stage fuel supply pipe are provided with fastening nuts. The fastening nuts have internal threaded holes. The main combustion stage fuel supply pipe and the pre-combustion stage fuel supply pipe pass through the external threaded portion and are respectively fixed to the pre-combustion stage fuel supply positioning hole and the main combustion stage fuel supply positioning hole. The fastening nuts are fixed to the external threaded portion by threaded connection.

5. The fuel nozzle as described in claim 4, characterized in that, The fastening nut is provided with a ball head seal, and the inner side of the external thread of the oil pipe mounting seat is provided with a conical surface. When the fastening nut is fixed to the oil pipe mounting seat, the ball head seal abuts against the conical surface.

6. The fuel nozzle as described in claim 3, characterized in that, The pre-combustion stage oil supply pipe is equipped with a pre-combustion stage oil pipe connector at its top. The inner side of the pre-combustion stage oil pipe connector has a conical surface. The pre-combustion stage oil circuit also includes a spherical inlet connector. The spherical inlet connector has a spherical connecting portion. When the spherical inlet connector is connected to the pre-combustion stage oil pipe connector, the spherical connecting portion abuts against the conical surface; and / or The main combustion stage fuel supply pipe is provided with a main combustion stage fuel pipe connector at the top. The main combustion stage fuel pipe connector has a conical surface on its inner side. The main combustion stage fuel circuit also includes a spherical fuel inlet connector. The spherical fuel inlet connector has a spherical connecting part. When the spherical fuel inlet connector is connected to the main combustion stage fuel pipe connector, the spherical connecting part abuts against the conical surface.

7. The fuel nozzle as claimed in claim 1, characterized in that, The pre-combustion stage nozzle also includes an adapter. The pre-combustion stage main oil supply pipe and the pre-combustion stage auxiliary oil supply pipe are welded to the adapter. The main nozzle sleeve is threaded to the adapter. The auxiliary nozzle sleeve is disposed inside the main nozzle sleeve. The main nozzle sleeve is threaded to press the auxiliary nozzle sleeve to the adapter.

8. The fuel nozzle as described in claim 7, characterized in that, The pre-combustion stage nozzle also includes a swirling core, which is disposed inside the auxiliary nozzle sleeve. The swirling core connects the pre-combustion stage auxiliary oil passage of the adapter and the oil outlet of the auxiliary nozzle sleeve. The side of the swirling core facing the adapter has a spherical connecting end, and the side of the adapter's pre-combustion stage auxiliary oil passage connected to the swirling core has a conical connecting end. The auxiliary nozzle sleeve presses against the swirling core, and the spherical connecting end abuts against the conical connecting end.

9. A single-head combustion chamber test device, characterized in that, It includes a casing assembly, a flame tube assembly, and a fuel nozzle as described in any one of claims 1-8, the fuel nozzle being fixed to the casing assembly and extending into the flame tube assembly.

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